Any long problem: the four steps
A standard method from Further applications: the steps.
Steps
- Understand: underline the numbers and the question. Draw a picture or table.
- Choose: which unit does this look like? List two or three possible methods.
- Do: carry it out step by step; write each step clearly.
- Check: is the answer sensible (units, size, sign)? Does it answer the question that was asked?
For the whole topic, read Further applications: key points, common mistakes and how the DSE tests it.